AutoCodes – Generic – P1505

P1505 Code - Idle Speed Control Actuator Signal Low

Quick Answer

The Idle Speed Control Actuator (ISCA) valve is installed on the intake manifold and controls the intake airflow that is bypassed around the throttle plate to keep constant engine speed when the throttle valve is closed. Common causes include Faulty Idle Speed Control Actuator (ISCA) valve, Idle Speed Control Actuator (ISCA) valve harness is open or shorted, Idle Speed Control Actuator (ISCA) valve circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1505 indicates Idle Speed Control Actuator Signal Low.
Common causes: Common causes include Faulty Idle Speed Control Actuator (ISCA) valve, Idle Speed Control Actuator (ISCA) valve harness is open or shorted, Idle Speed Control Actuator (ISCA) valve circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 50,353

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1505 Description

The Idle Speed Control Actuator (ISCA) valve is installed on the intake manifold and controls the intake airflow that is bypassed around the throttle plate to keep constant engine speed when the throttle valve is closed. The function of the ISCA valve is to maintain idle speed according to various engine loads and conditions, and also to provide additional air during starting. The ISCA valve consists of an opening coil, a closing coil, and a permanent magnet. Based on information from various sensors, the Engine Control Module (ECM) controls both coils by grounding their control circuits. According to the control signals from the ECM, the valve rotor rotates to control the by pass airflow into the engine.

OBDII Code P1505 - Idle Speed Control Actuator Signal Low - AutoCodes.com — P1505 Code - Idle Speed Control Actuator Signal Low

What does this mean?

What are the Possible Causes of the DTC P1505?

Faulty Idle Speed Control Actuator (ISCA) valve
Idle Speed Control Actuator (ISCA) valve harness is open or shorted
Idle Speed Control Actuator (ISCA) valve circuit poor electrical connection

How to Fix the DTC P1505?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1505 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1505 code?

Need more information on how to fix the P1505 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1505 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1505 Acura — Positive Crankcase Ventilation Air Leakage
P1505 Audi — Closed Throttle Position Does Not Close/Open Circuit
P1505 BMW — Idle Speed Control Valve Closing Solenoid Control Circuit Electrial
P1505 Chrysler — Vehicle Speed Output Circuit High
P1505 Dodge — Vehicle Speed Output Circuit High
P1505 Ford — Idle Air Control System at Adaptive Clip
P1505 Honda — Positive Crankcase Ventilation Air Leakage
P1505 Hyundai — Idle Speed Control Actuator Signal Low
P1505 KIA — Idle Speed Control Actuator Signal Low
P1505 Lincoln — Idle Air Control System at Adaptive Clip
P1505 Mazda — Idle Air Control At Adaptive Clip
P1505 Mercury — Idle Air Control System at Adaptive Clip
P1505 MINI — Idle Speed Control Valve Closing Solenoid Control Circuit Electrial
P1505 Subaru — Idle Control System Circuit High Input
P1505 Volkswagen — Closed Throttle Position Does Not Close/Open Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1505 Code

1. What are the common symptoms of OBDII code P1505 (Idle Speed Control Actuator Signal Low)?

- Common symptoms include rough idle, stalling at idle, poor acceleration, and the Check Engine Light being illuminated.

2. What are the possible causes of OBDII code P1505?

- The code may be caused by a faulty idle speed control actuator, damaged wiring or connectors, a vacuum leak, or a problem with the engine control module (ECM).

3. How can I diagnose the cause of OBDII code P1505?

- You can use a scan tool to read the code and perform a thorough inspection of the idle speed control actuator, wiring, and connectors. Checking for vacuum leaks and testing the ECM may also be necessary.

4. Is it safe to drive with OBDII code P1505 active?

- It is generally not recommended to drive with this code active, as it can lead to poor engine performance and potential stalling, which can be dangerous.

5. Can I repair OBDII code P1505 myself?

- Depending on your level of automotive knowledge and experience, you may be able to repair this code yourself by replacing the faulty idle speed control actuator, repairing wiring issues, or addressing vacuum leaks.

6. How much does it typically cost to repair OBDII code P1505 at a mechanic?

- The cost of repairing this code can vary depending on the underlying issue, but it may range from $100 to $500 or more, including parts and labor.

7. Will resetting the Check Engine Light make OBDII code P1505 go away?

- Resetting the Check Engine Light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on.

8. Can a dirty throttle body cause OBDII code P1505?

- While a dirty throttle body can contribute to idle control issues, it is not a direct cause of OBDII code P1505. It is still recommended to keep the throttle body clean for optimal engine performance.

9. How long does it take to repair OBDII code P1505?

- The repair time for this code can vary depending on the specific cause and complexity of the issue. It may take anywhere from 1 to 4 hours or more to diagnose and repair.

10. Are there any preventive maintenance tips to avoid OBDII code P1505 in the future?

- Regularly inspecting and maintaining the idle speed control system, addressing vacuum leaks promptly, and keeping the engine well-tuned can help prevent issues that lead to OBDII code P1505.